Every human have similar body parts yet, they look different from one another.
Why is that so?
Answers
Every cell in the mother and father of a child contains a complete set of X-shaped chromosomes.
These chromosomes of the parents came from both of their parents.
To make a sperm or an egg cell, only half of the chromosome is contributed.
The bodies of the parents of a child randomly choose genes from the two halves of the chromosomes and create a random mix.
Therefore, every human have similar body parts yet, they look different from one another.
If you just want to know why humans look different, that is mostly based on what part of the world their ancestors lived on. Swedes had been living on mountains by themselves, and blond hair and blue eyes was the only thing they had to choose from, so that became the norm. It’s also useful to get more sun, as explained below.
Africans lived in the sun all year, and while that is useful to make vitamin K, they were getting too much of it, so the produced more melanin to block some out. Those who lived up north didn’t get as much sun as they needed, so they had to become lighter.
With few exceptions, all cells in a person’s body have the same DNA and genes. As cells divide and grow different genes are expressed, resulting in different cell types. Those cells then produce a variety of proteins specific to the cells they form resulting in most of our chemistry. In general, the same is true for all cell-based life on earth.
One's DNA is not the same as others
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